HackMD
Assignment3: SoftCPU
Due: Nov 30, 2022
Requirements
- Following the instructions of srv32 - RISCV RV32IM Soft CPU, you shall modify the assembly programs used/done with Assignment2 and another LeetCode problem with medium difficulty for srv32 Simulation with Verilator.
- In other words, you need to prepare at least two RISC-V programs, one of which should be derived from Assignment2 and the other from scratch. We need a medium-difficulty LeetCode problem because we are ready to make aggressive optimizations.
- The programs for Assignment2 were tweaked for single-cycle RV32I core. However, srv32 has 3-stage pipeline, and you should rework the existing code to benefit from CPU pipelining.
- dhrystone is a good starting point for writing test cases.
- You should validate the results in your program(s).
- You should program in RISC-V assembly for the sake of further optimizations. Hint: You may modify a customized
Makefilefor building C and assembly source files from scratch.
- Check the generated file
wave.fstand use GTKwave to view the waveform. Then, explain how your program is executed along with srv32 Simulation.- Show the signals/events inside srv32 associated to PC, branch, instruction memory (
I-MEM), data memory (D-MEM), and instruction internals. - You shall discuss pipeline architecture along with your program.
- Show the signals/events inside srv32 associated to PC, branch, instruction memory (
- Propose the software optimizations (against your program) based on the pipeline design of srv32.
- fewer instructions
- shorter cycle counts
- eliminate unnecessary stalls
- more deterministic branches
- Write down your thoughts and progress in HackMD notes.
- Explain how srv32 works with Verilator.
- You should check Intel FPGA traning video Verilog HDL Basics and Verilog Tutorial.
- BONUS: Can you figure out the room to improve srv32?
Fill in the table for your homework
| Formal given name | HackMD note |
|---|---|
| Sample1 | Homework3 |
| Sample2 | Homework3 |
| Sample3 | Homework3 |
| Sample4 | Homework4 |
| 王昱承 | Homework3 |
| 黃昱澄 | Homework3 |
| 俞杉麒 | Homework3 |
| 賴致文 | Homework3 |
| 陳彥甫 | Homework3 |
| 黃冠予 | Homework3 |
| 江坤諦 | Homework3 |
| 洪嘉志 | Homework3 |
| 曾晧峖 | Homework3 |
| 王漢祺 | Homework3 |
| 陳品崴 | Homework3 |
| 黃榆哲 | Homework3 |
| 吳紀寬 | Homework3 |
| 張瑞甫 | Homework3 |
| 陳韋勳 | Homework3 |
| 張中龍 | Homework3 |
| 周士翔 | Homework3 |
| 陳奕萍 | Homework3 |
| 蘇勇達 | Homework3 |
| 莊集 | Homework3 |
| 何坤霖 | Homework3 |
| 潘鴻福 | Homework3 |
| 方宣翔 | Homework3 |
| 黃柏瑜 | Homework3 |
| 馮柏為 | Homework3 |
| 吳宇晨 | Homework3 |
| 鄭至崴 | Homework3 |
| 楊淳皓 | Homework3 |
| 陳靖雯 | Homework3 |
